Which statement about relative motion is not true?
A. A seated passenger on a plane is motionless relative to the plane.
B. A flight attendant walking down the aisle is in motion relative to the plane/
C. A plane appears motionless to a skydiver who jumps out of it.
D. The plan appears to be moving across the sky relative to a person watching from the ground.
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Which statement about relative motion is not true?
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